Ok.. So I have to change all my transactions to locked to get warnings about changing the transaction? I usually keep my transactions as reconciled so I can always edit them (like comments, splits etc) and set only payments (credit card payment) as locked which makes sense to not mess up with them after reconciliation no matter what. I can change all reconciled transactions to locked then. That is not a problem but i still want to keep created transaction mode. Having only "back" button in transaction edit window doesn't really tell user if he actually made some changes with transaction and basically with the back button only there is no way to abandon editing transaction without changes. Having save button and back button would definitely fix this confusion. Please think about it in next release